@Article{artola09,
  author = 	 {X. Artola and A D\'{\i}az de Ilarraza and A. Soroa and A. Sologaistoa},
  title = 	 {Dealing with Complex Linguistic Annotations within a Language Processing Framework},
  journal = 	 {IEEE Transactions on Audio, Speech and Language Processing},
  year = 	 {2009},
  volume = 	 {17},
  number = 	 {5},
  pages =        {904-915}
}